CN1582464A - Liquid crystal display device with a light guide plate - Google Patents
Liquid crystal display device with a light guide plate Download PDFInfo
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- CN1582464A CN1582464A CNA028221656A CN02822165A CN1582464A CN 1582464 A CN1582464 A CN 1582464A CN A028221656 A CNA028221656 A CN A028221656A CN 02822165 A CN02822165 A CN 02822165A CN 1582464 A CN1582464 A CN 1582464A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
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- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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Abstract
The emphasis converter 52 compares the image data of the current vertical synchronization with the image data of the previous vertical synchronization, and controls the input image data to the liquid crystal display panel 4 in accordance with the emphasis conversion parameters stored in the tables of the ROMs 3a to 3c to realize the overdrive. Even if the detected temperature fluctuates up and down beyond the temperature threshold, the microcomputer 38 can stably control the selection of the emphasis conversion parameter by delaying the detected temperature of the thermistor 37.
Description
Technical field
The present invention relates to make the LCD that image shows, relate in particular to the LCD that to improve the LCD panel optical response with LCD panel.
Background technology
Recently become lighter and thinner because of personal computer and television receiver, also wish to alleviate the attenuate display device, developed LCD flat displays such as (LCDs) for this reason to replace cloudy plate ray tube (CRTs).
LCD a kind ofly passes that the liquid crystal layer with anisotropy specific inductive capacity applies electric field and the display device that shows the required image data, and liquid crystal layer is injected between the pair of substrate, so control electric field intensity may command is by the light quantity of substrate.This class LCDs is typical light and handy flat display example.Wherein, the main use the TFT LCDs of thin film transistor (TFT) (TFT) as on-off element.
Recently, because LCDs also is widely used as the televisor display device not only as calculator display organization, therefore more require to manifest moving image.But because of conventional LCDs response speed slow, so they have the defective of very difficult reproducing motion pictures.
In order to solve the response speed problem of LCD, a kind of known LCD drive method is arranged, wherein, according to the combination of previous frame input image data and present frame input image data, LCD panel is applied than higher (upper punch) driving voltage of predetermined gray level voltage (corresponding to the input image data of present frame) or lower (dashing down) driving voltage.In present specification, should the driving method be defined as upper punch (OS) driving method.
Fig. 1 illustrates conventionally the illustrative configurations towards driving circuit.Specifically, the N frame input image data (current data) that will show and (N-1) frame input image data (last data) of just being deposited in frame memory 1 all packed into increase the weight of converter 2, wherein search the voltage data that the gray level transitions pattern between these data and N frame input image data applies with identification with the voltage data table that applies that is stored in 3 li of table storeies (ROM), and determine that according to the voltage data (increasing the weight of conversion parameter) that applies that obtains like this N two field picture shows the required gray-scale data (increasing the weight of data converted) of writing, thereby offer LCD panel 4.Here, increasing the weight of converter 2 and table storer 3 constitutes one and writes gray level and determine device.
Apply voltage data (increasing the weight of conversion parameter) from what the actual measurement optical response of LCD panel 4 obtained being stored in 3 li of table storeies in advance.For example, be video data number when being the gray scale of 256 8 bit representations at the shows signal level number, each gray level all has one section to apply voltage data.Perhaps also can only store nine representative gray level measured values as shown in Figure 2, a value is used for each 32 gray level, by line interpolation or other computing of above-mentioned measured value, determines the voltage data that applies of other gray level.
It is chronic from certain half gray level transitions to second half gray level that a problem is arranged, and (as being 16.7 milliseconds when the lining by line scan of 60Hz) shows half gray scale so general LCD panel can't be in a frame period.This not only produces twilight sunset, also hinders half correct gray scale to show.But use above-mentioned upper punch driving circuit, then can show half gray level of aiming at short notice, as shown in Figure 3.
Also know, liquid crystal response speed is obviously shown and is depended on temperature, a kind of liquid crystal display sheet drive as the flat 4-318516 announcement of Japanese Unexamined Patent Publication No, for dealing with any temperature variation of LCD panel, the response speed of grey scale change is done stepless control and kept the optimization state and do not damage display quality.
This structure comprises: for showing the RAM of storage one frame of digital view data; Detect the temperature sensor of liquid crystal display plate temperature; And data converting circuit, be used for aforementioned Digital Image Data and the view data of reading from RAM one frame delay are made comparisons, if the view data before a current image date and the frame has become, just press the temperature of said temperature sensor, along change direction current image date is done to increase the weight of conversion, drive LCD panel with view data and show according to this data converting circuit output.
Particularly, suppose a liquid crystal display plate temperature that is detected by temperature sensor for example is divided into three scope Th, Tm and Tl (Th＞Tm＞Tl), and be defined as Mh, Mm and Ml from three mode signals that A/D converter is exported to data converting circuit corresponding to these scopes, simultaneously in the ROM of data converting circuit, stored the numeral " 3 " that equals mode signal in advance, by to current image date with postpone a frame image data assigned address or value and accessed image data table.Selection is corresponding to a table of input pattern signal, reads to be stored in the table by the address to be the current image date value and the view data of the memory location that postpones a frame image data value appointment, to be output the driving circuit to LCD panel again.
But in the above structure that the flat 4-318516 of Japanese Unexamined Patent Publication No discloses, three-mode signal Mh, Mm and Ml are by three value range Th, Tm of detected temperatures and Tl (Th＞Tm＞Tl) generate, and by mode signal Mh, Mm and Ml switching increasing the weight of in groups conversion parameter.Therefore, for example if the liquid crystal display plate temperature instability that detects, variation up and down in Th, Tm and Tl scope, then also frequent variations between Mh, Mm and Ml of mode signal, so concerning same gray level transitions, increase the weight of conversion parameter and will change from what ROM read.As a result, the image that shows on the LCD panel causes flicker, deterioration picture element.
Also have certain situation, picture element changes deteriorations because of temperatures span LCD panel 4, as the rear view of Fig. 4 liquid crystal display device structure with direct type backlight module is shown.Among Fig. 4, the 4th, LCD panel, the 11st, the fluorescent light of the LCD panel of throwing light on from behind 4, the 12nd, the inverter transformer that fluorescent light 11 is energized, the 13rd, power supply unit, the 14th, video processing circuits plate, the 15th, sound treatment circuit plate, the 16th, temperature sensor.
Show obviously that wherein the heat radiation object that influences LCD panel 4 response speed characteristics is electrode part, inverter transformer 12 and the power supply unit 13 of fluorescent light 11.From its re-set target, temperature sensor 16 is preferably arranged in LCD panel 4 the insides, but very difficult, thus should be connected to another member to it, as circuit board.
Therefore, for example arranging component parts 11～15 o'clock as Fig. 4, temperature sensor 16 is connected to sound treatment circuit plate 15, the latter is minimum to be subjected to the influence of inverter transformer 12 and power supply unit 13 heatings, and the output that allows the upper punch driving circuit that is arranged on 14 li of video processing circuits plates utilize this temperature sensor 16 to detect.
Equally as in the direct type of using U-shaped fluorescent light 11 shown in Fig. 5 (a) LCD backlight, in the peripheral type of using L shaped fluorescent light 11 shown in Fig. 5 (b) LCD or arbitrary similar structures backlight, settled fluorescent light 11 electrodes part and big temperature rise appears in the subregion of inverter transformer that fluorescent light 11 is energized in LCD panel 4, so compare with the shadow region of Fig. 5, other district heats up bigger.
In conventional LCD, the temperature supposition that single temperature sensor 16 detects is the temperature of whole LCD panel 4, and makes the upper punch drive controlling frame by frame according to this detection.But in actual conditions, according to the arrangement of above-mentioned heater element, the Temperature Distribution that LCD panel 4 changes in panel surface has the plane.
As a result, temperature is higher than the subregion of temperature sensor 16 detected temperatures on LCD panel 4, and the data that provide (increasing the weight of data converted) apply undertension, may cause the shade hangover.Otherwise temperature is lower than the subregion of temperature sensor 16 detected temperatures on LCD panel 4, and it is excessive that the data that provide (increasing the weight of data converted) apply voltage, can cause (in normal black patterns) such as white light spots, makes the serious deterioration of picture element of display image.
Similarly, if place room conditioning to the local of its blowing or place the place of sunlight or sunlight direct projection this LCD, LCD panel 4 parts can be lowered the temperature or heat up, and cause the Temperature Distribution that changes in the plane on LCD panel 4 surfaces.The result, can be in the subregion provide data (increasing the weight of data converted) to apply voltage excessive, cause the white light spot, or LCD panel 4 provided the undertension that applies of data (increasing the weight of data converted), cause shade hangover (when often deceiving pattern), so the serious deterioration of the picture element of display image.Because screen size becomes bigger, the problem that this Temperature Distribution that changes in the plane of LCD panel 4 depends on the installation site is just more obvious.
Under above-mentioned conventional case of liquid crystal displays, when normal mounting state shown in Fig. 6 (a) (perpendicular dress attitude), temperature sensor 16 is contained in the minimum influence that is subjected to inverter transformer 12, power supply unit 13 and other element heating in addition.But place at screen and to revolve shown in vertical upside-down mounting attitude shown in Fig. 6 (b) (from the ceiling state that suspends) or Fig. 6 (c) when turning 90 degrees (portrait alignment mode), heat flow path changes, heat flow path changes, thereby temperature sensor 16 seriously is subjected to the influence of other member heating, so no longer can detect the temperature accurately of LCD panel 4.
The result, can't provide the data that correctly apply (increasing the weight of data converted) voltage corresponding to its temperature to LCD panel 4, the picture element that causes display image is by because of applying shade hangover that not enough data (increasing the weight of data converted) voltage caused or because of apply the obviously problem of deterioration of the white light spot that excess data (increasing the weight of data converted) voltage causes (when the normal black pattern) to LCD panel 4 to LCD panel 4.
For this reason, the present invention is just managing to have solved above problem, thereby a purpose provides a kind of LCD that can improve the display image picture element, and its method is, even device interior detect the temperature instability, also can do add and become control increasing the weight of conversion parameter with stable manner.
Even another purpose provides the Temperature Distribution that the variation in the plane appears in a kind of LCD panel screen surfaces, also can prevent the LCD of display image deterioration.
Summary of the invention
For realizing above purpose, the present invention disposes as follows:
According to first invention, LCD is by more current at least vertical synchronization view data and last vertical cycle view data, and, can quicken to drive LCD panel according to the input image data that increases the weight of data parameters control LCD panel that obtains from comparative result.This LCD comprises: temperature measuring equipment is used for the checkout equipment internal temperature; And control device, be used for device interior temperature by the temperature measuring equipment detection, control all conversion parameters that increases the weight of changeably, it is characterized in that by the device interior temperature is set up hysteresis, control device produces a parameter control signal to increasing the weight of the variable control of conversion parameter.
According to second invention, a kind ofly make the LCD that image shows with LCD panel and comprise: a plurality of temperature measuring equipments are used to detect the temperature of the multiple cut section of LCD panel; With one write gray level and determine device, be used for determining LCD panel optic response feature is done the translation data that increases the weight of of compensation, method is the data segment that the input image data of a vertical cycle is divided into the multiple cut section of LCD, and the combination of the temperature that detects according to the cut section that shows input image data in the LCD panel and gray level transitions from last vertical cycle to current vertical cycle, the view data of every section input of cutting apart is done to increase the weight of conversion.
The 3rd invention is the LCD according to second aspect, wherein write gray level and determine that device comprises: predetermined a plurality of temperature ranges are stored a plurality of table storeies that several groups of differences increase the weight of conversion parameter, be used for input image data converted to and increase the weight of data converted, excessively compensate the optical response of LCD panel according to gray level from last vertical cycle to current vertical cycle; With a selector switch, be used for optical response according to LCD panel; With a selector switch, be used for showing that according to LCD panel the temperature that each cut section of input image data detects selects one of a plurality of table storeies, and the conversion parameter of reading from selector switch selected table storer that increases the weight of is used for determining the data converted that increases the weight of corresponding to input image data again it being offered LCD panel as writing gray-scale data.
The 4th invention is the LCD according to second invention, wherein write gray level and determine that device comprises: the table storer, in independently with reference to the list area, predetermined a plurality of temperature ranges several groups of different conversion parameters that increase the weight of have been stored, be used for input image data converted to and increase the weight of data converted, with optical response according to gray level overcompensation LCD panel from last vertical cycle to current vertical cycle: and a selector switch, be used for showing that according to LCD panel the temperature that each cut section of input image data detects selects a plurality of with reference to one of list area, and from selector switch table in the storer the selected conversion parameter of reading in reference to the list area that increases the weight of be used for determining the data converted that increases the weight of corresponding to input image data again it being offered LCD panel as writing gray-scale data.
The 5th invention is the LCD according to second invention, wherein write gray level and determine that device comprises: storage increases the weight of the table storer of conversion parameter, be used for input image data converted to and increase the weight of data converted, to compensate the optical response of LCD panel according to gray level transitions from last vertical cycle to current vertical cycle; One subtracter is used for from deducting input image data with increasing the weight of the definite data converted that increases the weight of of conversion parameter; One multiplier is used for the output signal and the weighting coefficient K of subtracter are multiplied each other, the temperature that K detects according to the cut section that shows input image data in the LCD panel and controlled changeably; With a totalizer, be used for the output signal of multiplier is added in the input image data, again the output signal of totalizer is supplied with LCD panel as writing gray-scale data.
According to the 6th invention, a kind ofly make the LCD that image shows with LCD panel and comprise: a plurality of temperature measuring equipments are used to detect the temperature of the multiple cut section of LCD panel; Calculation element is done predetermined calculating by the temperature data that a plurality of temperature measuring equipments are detected and is produced control signal; With write gray level and determine device, be used to determine to increase the weight of data converted, with gray level transitions input image data in the current vertical cycle is done the predetermined conversion that increases the weight of, compensate the optical response of LCD panel from last vertical cycle to current vertical Zhou Si by the control signal that produces according to calculation element.
The 7th invention is the LCD according to the 6th invention, wherein write gray level and determine that device comprises: predetermined a plurality of temperature ranges have been stored a plurality of table storeies that several groups of differences increase the weight of conversion parameter, be used for input image data converted to and increase the weight of data converted, with optical response according to the compensation of the gray level transitions from last vertical cycle to current vertical Zhou Si LCD panel; With a selector switch, the control signal that is used for producing according to calculation element is selected a plurality of one of storeies of depositing, and the conversion parameter of reading in the selector switch selected table storer that increases the weight of is used for determining the translation data that increases the weight of corresponding to input image data, again it as writing gray-scale data supply LCD panel.
The 8th invention is the LCD according to the 6th invention, wherein write gray level and determine that device comprises: the table storer, in independently with reference to the list area, predetermined a plurality of temperature ranges are stored several groups of different conversion parameters that increase the weight of, be used for input image data converted to and increase the weight of data converted, with optical response according to the compensation of the gray level transitions from last vertical cycle to current vertical Zhou Si LCD panel; With a selector switch, the control signal that is used for producing according to calculation element is selected a plurality of with reference to one of list area, and from selector switch selected table storer, be used for definite data converted that increases the weight of corresponding to input image data with reference to the conversion parameter of reading in the list area that increases the weight of, again it is supplied with LCD panel as writing gray-scale data.
The 9th invention is the LCD according to the 6th invention, wherein write gray level and determine that device comprises: storage increases the weight of the table storer of conversion parameter, be used for input image data converted to and increase the weight of data converted, with optical response according to the compensation of the gray level transitions from last vertical cycle to current vertical cycle LCD panel; One subtracter is used for from deducting input image data with increasing the weight of the definite data converted that increases the weight of of conversion parameter; One multiplier is used for the output signal of subtracter and weighting coefficient K are multiplied each other, and K is controlled changeably according to the control signal that calculation element produces; With a totalizer, be used for multiplier output signal be added in the input image data, and the output signal of totalizer is supplied with LCD panel as writing gray-scale data.
The tenth invention is according to the LCD of arbitrary invention in the 6th to the 9th invention, and wherein calculation element produces control signal by the mean value of the temperature calculating a plurality of temperature measuring equipments and detect.
The 11 invention is according to the LCD of arbitrary invention in the 6th to the 9th invention, and wherein calculation element produces control signal by the maximal value of the temperature calculating a plurality of temperature measuring equipments and detect.
The 12 invention is the LCD according to arbitrary invention in the 6th to the 9th invention, and wherein calculation element produces control signal by calculating the minimum value that a plurality of temperature measuring equipments detect temperature.
The 13 invention is the LCD according to arbitrary invention in the 6th to the 9th invention, and wherein calculation element produces control signal by making the histogram that a plurality of temperature measuring equipments detect temperature.
The 14 invention is the LCD according to arbitrary invention in the 6th to the 9th invention, and wherein calculation element produces control signal by calculating the weighted mean that a plurality of temperature measuring equipments detect temperature.
The 15 invention is according to the LCD of the 14 invention, also comprises the characteristic quantity pick-up unit that is used to detect the output image data characteristic quantity, and wherein the characteristic quantity that detects according to the characteristic quantity pick-up unit determines that a plurality of temperature measuring equipments detect the weighted mean of temperature.
The 16 invention is according to the LCD of the 14 invention, also comprises the mount state testing device that is used for the checkout equipment installment state, and wherein the installment state that detects according to mount state testing device determines that a plurality of temperature measuring equipments detect the weighted mean of temperature.
The 17 invention is according to the LCD of the 14 invention, also comprises the user command pick-up unit that detects user input commands, and wherein the user command that detects according to the user command pick-up unit determines that a plurality of temperature measuring equipments detect the weighted mean of temperature.
The 18 invention is that wherein calculation element produces control signal by the temperature that the predetermined temperature device of only taking a sample detects in the temperature that a plurality of temperature measuring equipments detect according to the LCD of arbitrary invention in the 6th to the 9th invention.
The 19 invention is the LCD according to the 18 invention, also comprise the characteristic quantity pick-up unit that detects the input image data characteristic quantity, wherein the characteristic quantity that detects according to the characteristic quantity pick-up unit detects the temperature that the predetermined temperature measuring equipment of only taking a sample the temperature detects from a plurality of temperature measuring equipments.
The 20 invention is the LCD according to the 18 invention, the mount state testing device that also comprises the checkout equipment installment state, wherein the installment state that detects according to mount state testing device detects the temperature that the predetermined temperature measuring equipment of only taking a sample the temperature detects from a plurality of temperature measuring equipments.
The 21 invention is the LCD according to the 18 invention, also comprise the user command pick-up unit that detects user input commands, wherein the user command that detects according to the user command pick-up unit detects the temperature that the predetermined temperature measuring equipment of only taking a sample the temperature detects from a plurality of temperature measuring equipments.
The invention provides following operation and effect.
In other words, first invention by above configuration even the temperature instability that detects in the equipment increases the weight of conversion parameter by controlling changeably with stationary mode, also can improve the picture element of display image.
By second to the 5th invention of above configuration, according to the temperature that LCD panel each several part zone detects, the defeated view data that preparation is presented at this subregion is done suitable upper punch driving.Therefore, can obtain the gray-scale data of writing, prevent display image picture element deterioration corresponding to Temperature Distribution in the plane on LCD panel surface.
By the 6th to the 21 invention of above configuration, even because the suitable conversion process that increases the weight of also can be made to input image data when the Temperature Distribution of variation occurring in the LCD panel surface on the plane in, so can prevent the display image deterioration.
Brief description
Fig. 1 is conventional LCD upper punch driving circuit structure block diagram.
Fig. 2 is the table content of the OS table storer of a routine upper punch driving circuit use.
Fig. 3 schematically illustrates the voltage that is added to liquid crystal and the relation of liquid crystal response characteristic.
Fig. 4 is the illustrative configurations example from the direct backlight type LCD of back side observation.
Fig. 5 comprises some schematic views: the direct backlight type LCD of using the U-shaped fluorescent light (a) is shown, the edge backlight type LCD of using L type fluorescent light (b) is shown.
Fig. 6 comprises some LCD views: (a) normal mounting state, (b) vertical inversion state and (c) 90 degree rotation status.
Fig. 7 is a main element illustrative configurations block diagram among LCD first embodiment of the present invention.
Fig. 8 comprises some schematic, and the table content in the ROM among a few example first embodiment is shown.
Fig. 9 schematically illustrates the relation that detects temperature among first embodiment and increase the weight of conversion parameter.
Figure 10 is the hysteresis processing flow chart among first embodiment.
Figure 11 is the hysteresis processing flow chart of LCD second embodiment of the present invention.
Figure 12 is the table content of another routine ROM among second embodiment.
Figure 13 is the illustrative configurations block diagram of main element among LCD the 3rd embodiment of the present invention.
Figure 14 comprises some charts, and the table content of the OS table storer of the 3rd embodiment use is shown.
Figure 15 is the illustrative configurations block diagram of main element among LCD the 4th embodiment of the present invention.
Figure 16 illustrates the table content of the OS table storer that the 4th embodiment uses.
Figure 17 writes gray scale to determine that device disposes routine block diagram among LCD the 5th embodiment of the present invention.
Figure 18 is the illustrative configurations block diagram of main element among LCD the 6th embodiment of the present invention.
Figure 19 is the functional block diagram of control CPU among the 6th embodiment.
Figure 20 schematically illustrates the relation that detects temperature among the 6th embodiment and increase the weight of the conversion parameter layer.
Figure 21 illustrates the histogram that detects temperature among the 6th embodiment.
Figure 22 is a main element illustrative configurations block diagram among LCD the 7th embodiment of the present invention.
Figure 23 schematically illustrates the table content of the OS table storer of the 7th embodiment use.
Figure 24 writes gray level to determine that device disposes routine block diagram among LCD the 8th embodiment of the present invention.
Figure 25 is a main element illustrative configurations block diagram among LCD the 9th embodiment of the present invention.
Figure 26 is a main element illustrative configurations block diagram among LCD the tenth embodiment of the present invention.
Figure 27 is a main element illustrative configurations block diagram among LCD the 11 embodiment of the present invention.
Implement better model of the present invention
Describe all embodiment of the present invention with reference to the accompanying drawings.
First embodiment
Referring now to Fig. 7～10 in detail first embodiment of the invention is described in detail.Here, Fig. 7 is the illustrative configurations block diagram of this routine LCD main element; Fig. 8 comprises some charts, and the table content in the ROM in this routine LCD is shown; Fig. 9 illustrates and detects temperature and the relation of switching the layer that increases the weight of conversion parameter in this routine LCD; Figure 10 is the hysteresis processing flow chart of this routine LCD.
Among Fig. 7, the 1st, frame memory (FM), the 3rd, store the table storer (ROM) that increases the weight of conversion parameter by the input image data gray level transitions, the 52nd, increase the weight of converter, it reads the view data parameter with the former frame view data of reading and by comparative result (grayscale transition) by comparing the current frame image data in ROM3 in FMI, definite and output increases the weight of data converted (view data of compensation), and 5 are liquid-crystal controllers, it exports liquid crystal driving signals according to from the data converted that increases the weight of that increases the weight of converter 52 to the gate driver 6 and the Source drive 7 of LCD panel 4.
The 37th, the thermistor of checkout equipment internal temperature, the 38th, the microcomputer of output parameter control signal, this signal is handled doing to lag behind from the magnitude of voltage (detecting temperature) of thermistor 37, and selects control to increase the weight of conversion parameter from what ROM3 read.
In above configuration, ROM3 is made up of three ROM3a～3c, and layer 0～layer 2 storage of respectively doing for oneself corresponding to the device interior temperature increase the weight of conversion parameter in groups.As shown in Figure 8, ROM3a～3c stores a table separately, and that preserves in the table increases the weight of the grayscale transition (the shows signal number of plies be video data number be 8 or 256 gray levels) of conversion parameter corresponding to input image data.
Increase the weight of converter 52 and suitably select one from ROM3a～3c by parameter control signal from microcomputer 38, in the ROM3a～3c that selects, read to increase the weight of conversion parameter according to the grayscale transition from the former frame to the present frame, and according to the definite view data that will export to the compensation of liquid-crystal controller 5 of this parameter.
For example, if, be " 0 " from the former frame data of FM1, and the input image data of present frame is " 128 " from the parameter control signal indication " layer 0 " of microcomputer 38, then increase the weight of converter 52 and select ROM3a, obtain the conversion parameter that increases the weight of of indication " output data value 194 ".
Increase the weight of converter 52 according to the conversion parameter that increases the weight of, form 0～255 grade I/O table, consider that this increases the weight of the conversion parameter data, determine the view data (increasing the weight of data converted) of compensation, and it is exported to liquid-crystal controller 5 from ROM3.For example, when last frame data are 0 and current frame data when being 100, or in other words, during the no respective value of this table in being stored in ROM3 (in the table not designated value), increase the weight of converter 52 just to implement linear interpolation or other calculating output data value 175.
In this routine LCD, as shown in Figure 9, prepared three groups corresponding to the different temperature of device interior of three layers (layers 0～layer 2) and increased the weight of conversion parameter and be stored in the table of ROM3a～3c.For selecting to increase the weight of conversion parameter, be provided with threshold temperature Threash0 and Threash1.But the device interior temperature that detects when thermistor 37 problem that conversion parameter (layer 0～layer 2) constantly changes can occur increasing the weight of during around above-mentioned threshold temperature fluctuation.
For this reason, this example detects temperature with 38 pairs of thermistors of microcomputer and adds hysteresis and generation parameter control signal.This hysteresis that microcomputer 38 is carried out handle will be below with reference to the flow chart description of Figure 10.Here suppose microcomputer 38 temperature data of (as every 120 milliseconds) acquisition device interior termly in this example.
During beginning, from thermistor 37 obtain temperature datas (step S1) and with the preceding temperature data that once obtains make comparisons (step S2).If the Current Temperatures data are higher, in other words, if the device interior temperature has raise, just with the Current Temperatures data with work as the higher threshold value of anterior layer temperature, Threash (layer) adds α, (step S3) makes comparisons.The α here is the arbitrary value of being scheduled to.
When the Current Temperatures data are bigger,, operate and return step S1 when anterior layer increases 1 (step S4).If the Current Temperatures data are less, then operation return step S1 and when anterior layer need not constant (step S5).
On the other hand, if judge that at step S2 the Current Temperatures data are lower, in other words, if the device interior temperature has reduced, then with the Current Temperatures data and when the lower temperature threshold of anterior layer, Threash (layer 1) adds α, and (step S6) makes comparisons.In the Current Temperatures data hour, when anterior layer subtracts 1 (step S7), step S1 is returned in operation.If the Current Temperatures data are bigger, operation return step S1 and when anterior layer need not constant (step S8).
For example, if currently increase the weight of the temperature that conversion parameter once obtains before being higher than for the layer 1 current temperature that obtains, just Current Temperatures is added α with Threash1 and make comparisons, if still higher, then this layer steps to layers 2.If the temperature that the current temperature that obtains once obtains before being lower than subtracts α to Current Temperatures with Threash0 and makes comparisons, if still lower, then this layer step reduces to layer 0.
As previously mentioned, this example is suitably regulated temperature threshold ± α by temperature variation, adds hysteresis to detecting temperature.Therefore, even detecting temperature fluctuates up and down around temperature threshold, also can follow thermal perturbation and fluctuation significantly, thereby can improve the picture element of display image increasing the weight of the stable selection control of conversion parameter (layer 0～layer 2) realization, do not make to increase the weight of conversion parameter (layer 0～layer 2).
Second embodiment
Below with reference to Figure 11 in detail second embodiment of the invention is described in detail.Figure 11 is the hysteresis processing flow chart of this routine LCD.
The configuration of this routine LCD is identical with above-mentioned first embodiment that describes with reference to Fig. 7, and difference is the hysteresis processing of microcomputer 38, so describe this difference emphatically with reference to Figure 11.
Obtain the temperature data (step S11) of thermistor 37 earlier.Determine corresponding to the gained temperature data increase the weight of conversion parameter when anterior layer (step S12), increase the weight of layer that conversion parameter determines make comparisons (step S13) to what determine like this with having selected when anterior layer, if the two is identical, increase progressively all zero clearings of count value (step S14) with down counter, step S11 is returned in operation.
If current floor height is in the layer of determining, the count-up counter counting increases 1, and removes down counter counting (step S15), judges whether the count-up counter counting reaches 5 (step S16).If the count-up counter counting is less than 5, step S11 is returned in operation; If reach 5, the layer of then determining increases 1, and step S11 (step S17) is returned in operation.
Otherwise if be lower than definite layer when anterior layer predicates at step S14, the down counter counting increases 1, and removes count-up counter counting (step S18), judges whether the down counter counting reaches 5 (step S19).If the down counter counting is less than 5, step S11 is returned in operation; If reach 5, the layer of then determining subtracts 1, and step S11 (step S17) is returned in operation.
As mentioned above, this example adds hysteresis with the variation of fixing temperature threshold to detecting temperature by monitoring layer, and only just this layer is become new layer when concluding that this layer changes certainly.Therefore, fluctuate up and down at temperature threshold, also can stably select control, do not allow and increase the weight of conversion parameter (layer 0～layer 2) and then temperature fluctuation and change significantly, so can improve the picture element of display image to increasing the weight of conversion parameter (layer 0～layer 2) even detect temperature.
Among the embodiment more than the present invention, thermistor 37 is used as the device of checkout equipment internal temperature, but also can realize temperature detection without this method, even use and be generally the power supply that drives LCD panel 4 and the Temperature Detector institute output detection signal that is provided with, detection places near the driving voltage of the light source the LCD panel 4 and will detect as indirect temperature measurement signal, or uses any other method.
The temperature of directly measuring LCD panel 4 surfaces with temperature measuring equipment is no doubt preferable, but is difficult to realize.Therefore, generally be the temperature of measuring on the drive plate, compensate the deviation of itself and LCD panel 4 temperature again.Particularly, kept the temperature correlation data between the thermistor on LCD panel 4 surfaces and the drive plate in advance, and according to the deviation that records temperature on this data foundation and the drive plate.
At this moment, because of the temperature rise curve of drive plate different with LCD panel 4 surfaces from the temperature rise curve that power supply is activated to device interior filament saturation, should deposit the data of the temperature rise curve difference of a period of time indication that activates the back disappearance with power supply in microcomputer 38, and, control the temperature deviation that will compensate changeably by this time by the elapsed time after activating with the timer statistics power supply that fits over 38 li of microcomputers.
In addition, in the description of the above embodiment of the present invention, select to increase the weight of the device of conversion parameter and layer 0 is provided with three ROM3a～3c and can selects one of them to layers 2 though disposed by the device interior temperature, but layer 0 is specified and is deposited in the single ROM3 to all available corresponding address of all parameters of layer 2, as shown in figure 12, so can control the address that to visit changeably according to parameter control signal from microcomputer 38.
A kind of like this configuration also can be provided, and promptly the conversion parameter of reading in the ROM3 that increases the weight of does not switch, but changes by the calculated value that increases the weight of 52 li of converters.Can do following control this moment: be provided with one will read from ROM3 increase the weight of that conversion is multiplied each other with COEFFICIENT K (0＜K＜1) and according to the parameter control signal device of control coefrficient K value changeably.
In addition, in the invention described above embodiment, increase the weight of conversion parameter though be provided with three layers according to the device interior temperature, the present invention obviously is not limited to this.In order to determine more reliably and the key-course selection that the hysteresis of first and second embodiment of use capable of being combined is handled, this also is conspicuous.
And in embodiments of the present invention,, can improve the response speed of LCD panel by comparing former frame view data and current image date and using the conversion parameter that increases the weight of that obtains based on the comparison.A kind of like this configuration but certainly is provided, promptly determines to increase the weight of conversion parameter by the view data before two or three frames.
The 3rd embodiment
Below with reference to Figure 13 and 14 in detail third embodiment of the invention is described in detail.Be marked with same label with conventional example components identical and save its description.Figure 13 is the illustrative configurations block diagram of this routine LCD main element, and Figure 14 comprises the chart of the table memory content that this routine LCD of expression is used.
As shown in figure 13, this example comprises four temperature sensor 16a～16d, detects the panel temperature that LCD panel 4 is divided into the different cut sections in four picture districts separately.The number of partitions of LCD panel 4 is not limited to four, obviously can or not be divided into two or more districts with whole regional five equilibrium, and there is its own temperature commentaries on classics sensor in each district.
Determine device as writing gray level, this example comprises: a plurality of table storer 3d and 3e, store one group of difference corresponding to LCD panel 4 temperature separately and increase the weight of conversion parameter; With increase the weight of converter 22, be used to receive the former frame view data (last data) and the current frame image data (current data) that are stored in 1 li of frame memory, combination according to input data (gray level transitions) is read from arbitrary table storer (ROM) 3d or 3e and is increased the weight of conversion parameter accordingly, and present frame is imported data determine to increase the weight of data converted, with the optical response of compensation LCD panel 4.
This example also comprises control CPU17, according to the temperature data that temperature sensor 16a～16d detects LCD panel 4 cut sections, and choose reasonable table storer 3d or 3e.Correspondingly, increased the weight of to change by individual element ground with reference to arbitrary table storer (ROM) 3d or the 3e that control CPU17 selects, resupply LCD panel 4 corresponding to the input image data of cutting apart of LCD panel 4 each cut section.
Describe for simplifying, as table storer (ROM) 3, the present invention will be described for example, this example is provided with two class ROM as shown in figure 14, when the detecting temperature and be lower than predetermined threshold of temperature sensor 16a～16d, one class is used for the table storer 3d for layer 0 use, when the detecting temperature and be lower than predetermined threshold of temperature sensor 16a～16d, one class is used for the table storer 3d for layer 0 use, when the detecting temperature and be higher than this predetermined threshold of temperature sensor 16a～16d, the another kind of table storer 3e that is used for for layer 1 use, carries out upper punch and drives with reference to them by selectively.But much less, can use corresponding to three classes of three or more predetermined temperature ranges or multiclass ROM more.
In addition, if the shows signal level number is the video data number by 8 or 256 gray scales when constituting, though the conversion parameter (measured value) that increases the weight of shown in Figure 14 is stored to become representative gray level transitions pattern every 9 * 9 matrixes of 32 gray levels, and the present invention obviously is not limited thereto.
In the LCD panel of so configuration, select arbitrary table storer 3d or 3e according to the temperature that detects that obtains by each temperature sensor 16a～16d, and, read corresponding to the conversion parameter that increases the weight of from former frame to the present frame grayscale transition with reference to selected memory surface 3d or 3e.These increase the weight of conversion parameter and are used for linear interpolation or other operation, all gray level transitions patterns being determined the data converted that increases the weight of of input image data, and them as writing gray-scale data supply LCD panel 4.
For example, during the Temperature Distribution that occurs on LCD panel 4 surface changing in the plane shown in Figure 5, just to preparing to be presented at the input image data selection cryometer storer 3d in the low relatively shadow region of temperature, to determine to increase the weight of data converted with reference to this table; And the input image data of preparing to be presented in other high relatively district of temperature is selected pyrometric scale storer 3e, to determine to increase the weight of data converted with reference to this table.
Like this, with the display position of input image data on screen one among option table storer 3d and the 3e in phase, just can be in a frame (display image) usefulness not on the same group the conversion parameter that increases the weight of determine to increase the weight of data converted.Therefore, even the Temperature Distribution of variation in the plane appears in LCD panel 4 surfaces, also can increase the weight of to change input image data to the last each several part of LCD panel 4 screens by the temperature that detects in this district, can obtain correct gray-scale data, the optical response of compensation LCD panel 4 whole screens write thus corresponding to screen each several part temperature.
As a result, can prevent because of the white light spot appears in temperature variation part in the plane on LCD panel 4 surfaces, phenomenons such as shade hangover, thus prevent the picture element deterioration of display image.
More than among the 3rd embodiment, determine that device is by increasing the weight of converter 22 and showing storer (ROM) 3 and form though write gray level, it is (last that but a kind of binary function f that is for example defined by two variablees (be before the transition after gray level and the transition gray level) can be set, current) come substitution list storer 3, for the optical response of compensation LCD panel 4 determines to write gray-scale data.
The 4th embodiment
Below with reference to Figure 15 and 16 in detail fourth embodiment of the invention is described in detail.Be marked with same label with the 3rd embodiment components identical and omit description it.Figure 15 is the illustrative configurations block diagram of this routine LCD main element, and Figure 16 illustrates the table content of the used table storer of this routine LCD.
This routine LCD has the table storer 3 that single ROM3f is used for Figure 15, is configured to reference to it input image data be done to increase the weight of conversion with increasing the weight of converter 32, to determine to prepare to supply with the gray-scale data of writing of LCD panel 4.Here write gray level determine device by table storer (ROM) 3f with increase the weight of converter 32 and constitute, the latter with reference to by from the control signal of control CPU17 this show to select among storer (ROM) 3f with reference to the list area, determine to write gray-scale data.
As shown in figure 16, (layer 0 with layer 1) stored the conversion parameter that increases the weight of of high and low temperature to this table storer (ROM) 3f in each list area.According to the temperature that detects that obtains by temperature sensor 16a～16d, switch selectively and with reference to these storages increase the weight of conversion parameter with reference to list area (layer 0 and layer 1).
Specifically, according to the control signal of exporting according to the detection of each temperature sensor 16a～16d from control CPU17, select one of list area (layer 0 is to layer 1) that will reference changeably, simultaneously according to the gray level transitions from the former frame to the present frame, can read and increase the weight of conversion parameter with reference to the address in each list area, this moment, these parameters can be switched between two layers selectively.Much less, this example can each with reference to list area storage corresponding to three classes of predetermined three or more temperature ranges or more multiclass increase the weight of conversion parameter.
In the LCD of so configuration, according to the temperature that detects that obtains by each temperature sensor 16a～16d, with reference to one of list area (layer 0 or layer 1), and read the conversion parameter that increases the weight of with reference to list area (layer 0 or layer 1) among the option table storer 3f corresponding to the grayscale transition from the former frame to the present frame with reference to what select.These increase the weight of conversion parameter and are used to implement linear interpolation or other operation, all gray level transitions patterns being determined the translation data that increases the weight of of input image data, and them as writing gray-scale data supply LCD panel 4.
For example, when Temperature Distribution that changing in the plane shown in Figure 5 appears in LCD panel 4 surface, just select low temperature with reference to list area (layer 0), to determine to increase the weight of data converted with reference to this table to preparing to be presented at input image data in the low relatively shadow region of temperature; Select high-temperature with reference to list area (floor 1), to determine to increase the weight of data converted to the input image data of preparing to be presented in other high relatively district of temperature simultaneously with reference to this table.
Like this, by selecting in phase with reference to one of list area (layer 0 with layer 1) with the display position of input image data on screen, just can with a frame interior (display image) not on the same group the conversion parameter that increases the weight of determine to increase the weight of data converted.Therefore, even the Temperature Distribution of variation in the plane appears in LCD panel 4 surfaces, also can increase the weight of to change input image data to each part on LCD panel 4 screens by the temperature that detects in this district, obtain the correct gray-scale data of writing thus corresponding to screen each several part temperature, thus the optical response of compensation LCD panel 4 whole screens.
As a result, can prevent to prevent the picture element deterioration of display image because of phenomenons such as the local white light spot that occurs of temperature variation in the plane on LCD panel 4 surfaces, shade hangovers.
The 5th embodiment
Below with reference to 17 in detail fifth embodiment of the invention is described in detail.Be marked with same label and omit with the 4th embodiment components identical it is referred to state.Figure 17 writes the block diagram that gray level is determined device in this routine LCD.
As shown in figure 17, this routine LCD is write gray level and is determined fixture, for example comprises: increase the weight of converter 2, be used for determining to increase the weight of conversion according to the conversion parameter of reading from table storer (ROM) 3 that increases the weight of; Subtracter 20 is used for deducting input image data from increasing the weight of converter 2 definite data converted that increase the weight of; Multiplier 21 is used for the signal and the weighting coefficient K of subtracter 20 outputs are multiplied each other; With totalizer 23, be used for the signal of multiplier 21 output is added in the input image data and produce and write gray-scale data.Control signal according to from control CPU17 is controlled to variation to the value of weighting coefficient K, controls the gray-scale data of writing of preparing to supply with LCD panel 4 thus changeably.
In the LCD of so configuration, CPU17 is according to the temperature that detects that obtains from corresponding temperature sensor 16a～16d in control, LCD panel 4 is respectively cut apart weighting coefficient K=1 ± α that viewing area control multiplier 21 changes, can go up the different temperature in viewing area by LCD panel 4 screens thus input image data is done the suitable conversion that increases the weight of.
For example, when Temperature Distribution that changing in the plane of Fig. 5 appears in LCD panel 4 surfaces, just the signal that weighting coefficient K is set to multiplier 21 output of 1-α is added to the input image data of preparing to be presented in the low relatively shadow region of temperature, simultaneously the signal that weighting coefficient K is set to multiplier 21 outputs of 1+ α is added to and prepares to be presented at input image data in other high relatively district of temperature, and the gray-scale data of writing of supply LCD panel 4 is prepared in control changeably thus.
Like this, by in phase the weighting coefficient K of multiplier 21 being done variable control with the display position of input image data on screen, just can be in a frame (display image) definite gray-scale data of writing that increases the weight of conversion process by difference.Therefore, even the Temperature Distribution of variation in the plane appears in LCD panel 4 surfaces, also can utilize and detect the weighting coefficient K that temperature goes up the variable control of each several part to LCD panel 4 screen by this district and handle input image data, obtain the suitable gray-scale data of writing thus, thereby correctly compensate the optical response of LCD panel 4 whole screens corresponding to screen each several part temperature.
As a result, can prevent to occur phenomenons such as white light spot, shade hangover, thereby prevent the picture element deterioration of display image because of temperature variation part in the plane on LCD panel 4 surfaces.
The 6th embodiment
Referring now to Figure 18～21 in detail sixth embodiment of the invention is described in detail.Be marked with identical label and omit with conventional example components identical it is referred to state.Figure 18 is the illustrative configurations block diagram of this routine LCD main element, Figure 19 is the functional block diagram of expression control CPU in this routine LCD, Figure 20 illustrates the relation that detects temperature in this routine LCD and increase the weight of the conversion parameter layer, and Figure 21 detects the histogrammic chart of temperature in this routine LCD of expression.
As shown in figure 18, this routine LCD comprises four temperature sensor 16a～16d, can detect the panel temperature that LCD panel 4 is divided into the different cut sections in four picture districts.Here the differentiation of LCD panel 4 is cut number and is not limited to four, but much less, whole zone can be divided into two or more zones that respectively contain temperature sensor.
Determine device as writing gray level, this example comprises: a plurality of table storer 3g～3i, store a different set of conversion parameter that increases the weight of, separately corresponding to the temperature characterisitic of LCD panel 4; With increase the weight of converter 22, be used to receive the former frame view data (last data) and current frame image data (current data) that are stored in 1 li of frame memory, read from one of table storer (ROM) 3g～3i according to the combination of input image data (gray level transitions) and to increase the weight of conversion parameter accordingly, and the present frame input image data determined to increase the weight of data converted, with the optical response of compensation LCD panel 4.
This example also comprises control CPU17, the temperature data that it detects LCD panel 4 cut sections according to aforementioned temperature sensor 16a～16d, one of choose reasonable table storer 3g～3i.Control CPU17 comprises: as shown in figure 19, computing unit 18, temperature data a～the d that is used for temperature sensor 16a～16d is detected makes predetermined computation, with hysteresis processor 19, be used for computing unit 18 is calculated the data do hysteresis processing of output, stably produce control signal for selecting and showing storer 3g～3i more than the control.
Thereby in this example, in response to the control signal that control CPU17 produces, can be with the selection of one of control table storage (ROM) 3g～3i of frame unit.In other words, use based on the conversion parameter that increases the weight of of a table storer switching rationally among table storer (ROM) 3g～3I that selects input image data is done to increase the weight of conversion, data converted like this can be supplied with LCD panel 4 as writing gray-scale data.
Describe for simplifying, will describe this example, implement upper punch control by selecting a kind of ROM wherein at the upper punch drive scheme that is provided with three kinds of ROM.Among these three kinds of ROM, a kind of use when being stored in detecting temperature and being lower than first predetermined threshold (Thveash0) of LCD panel 4 for table storer 3g increase the weight of conversion parameter (layer 0), another kind of for table storer 3h be stored in LCD panel 4 detect the use of temperature between first and second predetermined threshold (Threash0 and Threash1) increase the weight of conversion parameter (layer 1), also have a kind of for table storer 3i, be stored in LCD panel 4 detect temperature be higher than second predetermined threshold (Threash1) use increase the weight of conversion parameter (layer 2).But much less, can use four kinds or more kinds of ROM corresponding to four or more predetermined temperature ranges.
When shows signal level number or video data number were 8 or 256 gray scales, each shows storer (ROM) 3g～3i but can keep increasing the weight of conversion parameter to all 256 gray levels.Perhaps, each shows storer only to nine representative gray levels of picking up with 32 grey level interval or only five representative gray levels storages of picking up with 64 grey level interval are increased the weight of conversion parameter, wherein use linear interpolation or other operation, can according to above increase the weight of that conversion parameter determines other gray level transitions increase the weight of data converted (writing gray-scale data).
In the LCD of so configuration, control CPU17 detects temperature data a～d according to what obtain from temperature sensor 16a～16d, produce the control signal of selecting to increase the weight of conversion parameter, and according to one of control signal option table storer 3g～3i that is fit to each frame.
Select like this among reference table storer 3g～3i then one, read corresponding to the conversion parameter that increases the weight of from former frame to the present frame grayscale transition.These increase the weight of conversion parameter and are used to carry out linear interpolation or other operation, all gray level transitions patterns being determined input image data through increasing the weight of data converted, and they are supplied with LCD panel 4 as writing gray-scale data.
In this example, for response liquid crystal display board 4 is selected the suitable conversion parameter that increases the weight of because of the Temperature Distribution that changing in the plane appears in heater element position or equipment installment state, determine to select to increase the weight of the control signal of conversion parameter, its method is to make the temperature data that detects of 18 couples of temperature sensor 16a～16d of computing unit of control CPU17 do following operation.
(1) mean value
Determine that temperature sensor 16a～16d detects the mean value of temperature data a～d, this worthwhile electing is increased the weight of the control signal of conversion parameter.Like this, the mean value that detects temperature data a～d is used for selecting control to increase the weight of conversion parameter, even thereby the graphic memory of LCD panel 4 in the part tangible temperature variation, also can to full frame selection suitable increase the weight of conversion parameter.
(2) maximal value
Determine that temperature sensor 16a～16b detects the maximal value of temperature data a～d, this value is increased the weight of the control signal of conversion parameter with electing.Like this, the maximal value that detects temperature data a～d is used for selecting control to increase the weight of conversion parameter, thereby even in LCD panel 4 inner the branch some low-temperature space appears, also can prevent because of selecting excessive white light spot (often deceiving in the pattern) or other defective that conversion parameter causes that increase the weight of for use.
(3) minimum value
Determine that temperature sensor 16a～16b detects the minimum value of temperature data a～d, this value is increased the weight of the control signal of conversion parameter with electing.Like this, the minimum value that detects temperature data a～d is used for selecting control to increase the weight of conversion parameter, even thereby some high-temperature region appears in the part in LCD panel 4, also can prevent because of selecting for use and underestimate shade hangover (in normal black pattern) and other defective that increases the weight of conversion parameter and cause.
(4) histogram (majority decision)
Measure the frequency that temperature sensor 16a～16d detects temperature data a～d and distribute (histogram), determine to select to increase the weight of the control signal of conversion parameter by the temperature range of the most frequent appearance.As shown in figure 21, if the temperature that detects of data a～d mainly is distributed between first and second threshold temperature Threash1, just select to increase the weight of the control signal of conversion parameter (layer 1) by the output of majority rule.
Like this, just produce corresponding to the most frequent temperature controlling signal that detects in the plane of screen with the histogram that detects temperature data a～d, switching controls increases the weight of conversion parameter in view of the above.Therefore, even local temperature changes in the LCD panel 4, also can select the conversion parameter that increases the weight of of optimization to majority picture district.
(5) weighted mean value
Like this, carry out switching controls with the weighted mean value that detects temperature data a～d and increase the weight of conversion parameter, can select to be fit to the conversion parameter that increases the weight of in expectation picture district.
The weighting coefficient l～o here can be the value that changes by the characteristic quantity of various conditions such as input image data and/or equipment installment state etc., is perhaps set arbitrarily by the user.In addition, must be presented at the principle of screen central authorities, can detect the bigger weighting coefficient of temperature data setting what shield central authorities based on eye-catching image.
(6) selective extraction
Detect among temperature data a～d at temperature sensor 16a～16d, only select to detect temperature data, and it is increased the weight of the control signal of conversion parameter with electing with the part of extracting the predetermined temperature sensor.Like this, only partial data comes switching controls to increase the weight of conversion parameter among temperature data a～d with detecting, even thereby have that local temperature changes in the plane of LCD panel 4, also can to the screen district selection of expecting suitable increase the weight of conversion parameter.
Here, in temperature sensor 16a～16d, should select which temperature sensor to extract and detect temperature data, can determine selectively by the characteristic quantity of various conditions such as view data and/or equipment installment state etc., or arbitrarily determine by the user.
Certainly can suitably select one of above numerical procedure (1)～(6) or their appropriate combination, by the characteristic quantity and/or the equipment installment state of various conditions such as input image data, or according to user input commands and controlled signal.
Should be noted that, when significant change (fierce fluctuation) is exported in the calculating of computing unit 18 as detect the temperature instability at device interior, the processor that stagnates 19 of control CPU17 is just carried out the processing of stablizing control signal, make this signal not follow this fluctuation, so can stably select control to increase the weight of conversion parameter, thereby improve the picture element of displayed image.
As mentioned above, in this routine LCD, be provided with the temperature sensor 16a～16d that detects a plurality of positions temperature in LCD panel 4 screens, their detecting temperature data produces a control signal through predetermined calculating, is used for switching between corresponding to a plurality of classifications of temperature range increasing the weight of conversion parameter.Therefore, even the Temperature Distribution that occur to change in the plane of LCD panel 4 also can be selected the suitable conversion parameter that increases the weight of at any time, so the hot spot that can prevent to produce, shade hangover etc. prevent the picture element deterioration of display image.
In the 6th embodiment, determine that device 2 is by increasing the weight of converter 2 and table storer (ROM) 3g～3i formation though write gray level, but can be provided with one is that the binary function f of the forward and backward gray level definition of transition is (last by for example two variablees, current) replace table storer 3g～3i, be identified for compensating LCD panel optical response write gray-scale data.
The 7th embodiment
Below with reference to Figure 22 and 23 in detail seventh embodiment of the invention is described in detail.Being marked with same symbol with the 6th embodiment components identical also omits its description.Figure 22 is the illustrative configurations pivot figure of this routine LCD main element, and Figure 23 schematically illustrates the used table memory content of this routine LCD.
This routine LCD has the table storer of single ROM3i as Figure 22, is configured to increase the weight of converter 32 and with reference to ROM3i input image data is done to increase the weight of conversion, to determine to prepare to supply with the gray-scale data of writing of LCD panel 4.The gray level of writing is here determined device by table storer (ROM) 3j with increase the weight of converter 32 and constitute, in latter's reference table storer (ROM) 3i by select from the control signal of control CPU17 with reference to the list area, determine to write gray-scale data.
As shown in figure 23, what table storage (ROM) 3j storage temperature was not higher than the first threshold temperature (Threash0) increases the weight of conversion parameter (layer 0), and temperature increases the weight of conversion parameter (layer 2) between what first and second threshold temperature (Threash0 and Threash1) increased the weight of that conversion parameter (layer 1) and temperature be not less than second threshold value (Threash1).
According to detecting the temperature controlling signal based on what obtain by temperature sensor 16a～16d, switch selectively and with reference to these stored each group increase the weight of conversion parameter with reference to the list area.Particularly, according to control signal from CPU17, selection will reference one of list area (layer 0 is to layer 2), simultaneously according to the gray level transitions from the former frame to the present frame, read and increase the weight of conversion parameter with reference to the address in the selected list area, this moment, these parameters can be switched between the arbitrary layer in three layers selectively.
Much less, this example also can each with reference to list area internal memory storage corresponding to four classes of predetermined four or more temperature ranges or more multiclass increase the weight of conversion parameter.
In the LCD of so configuration, detect temperature to determine control signal by predetermined computing from what a plurality of temperature sensor 16a～16d obtained, select in view of the above and reference table storer 3j in reference to one of list area (layer 0 or layer 2), thereby read the conversion parameter that increases the weight of corresponding to the grayscale transition from the former frame to the present frame.These parameters are used for linear interpolation or other operation, all gray level transitions patterns being determined the translation data that increases the weight of of input image data, and them as writing gray-scale data supply LCD panel 4.
Therefore, even occur the Temperature Distribution of variation in the plane of LCD panel 4, also can select the suitable conversion parameter that increases the weight of at any time, can correctly compensate the optical response of LCD panel 4 in view of the above, prevent to produce phenomenons such as white light spot, shade hangover, thereby prevent the picture element deterioration of display image.
The 8th embodiment
Below with reference to Figure 24 in detail eighth embodiment of the invention is described in detail.Be marked with same symbol with the 6th embodiment components identical and also omit its description, Figure 24 writes the block diagram that gray level is determined device in this routine LCD.
As shown in figure 24, this routine LCD is write gray level and is determined device, and for example, it comprises: increase the weight of converter 2, be used for determining to increase the weight of data converted according to the conversion parameter of reading from table storer (ROM) 3 li that increases the weight of; Subtracter 20 is used for deducting input image data from increasing the weight of converter 2 definite data converted that increase the weight of; Multiplier 21 is used for the output signal of subtracter 20 and weighting coefficient K are multiplied each other; With totalizer 22, be used for the output signal of multiplier 21 is added in the input image data and produce and write gray-scale data.Control signal according to from control CPU17 is controlled to variation to the value of weighting coefficient K, controls the gray-scale data of writing of preparing to supply with LCD panel 4 thus changeably.
In the LCD of so configuration, control CUP17 temperature sensor 16a～16d determines control signal by the temperature data that detects of predetermined computation, and according to this control signal, weighting coefficient K=1 ± α that control multiplier 21 each frame change, thereby can do the suitable conversion that increases the weight of to input image data.As a result, can correctly compensate the optical response of LCD panel 4, prevent to produce the white light spot, phenomenons such as shade hangover prevent the picture element deterioration of display image thus.
The 9th embodiment
Referring now to Figure 25 in detail ninth embodiment of the invention is described in detail.Being marked with same symbol with the 6th and the 7th embodiment components identical also omits its description.Figure 25 is the illustrative configurations block diagram of this routine LCD main element.
As shown in figure 25, this routine LCD comprises moving detector 24, being used for the amount of movement of input image data from the former frame to the present frame detected is its characteristic quantity, and is configured to control changeably according to the mobile result who detects the computing of the computing unit 18 of CPU17.
For example, for rest image or the image that seldom moves,, need not take the temperature of LCD panel 4 into account with twilight sunset, hangover or other image deterioration that the optical response that can not produce because of LCD panel 4 causes.Therefore, in order to detect to move to realize optimizing and to increase the weight of conversion greater than the input image data of predetermined extent to being moved detecting device 24, the temperature data that comprises the big picture district that moves by sampling only corresponding to image wherein, or the mean value of weighting made weighted calculation, produce the control signal of selecting to increase the weight of conversion parameter.
For example, when being that original image is shown in LCD panel frame central authorities, and black surround (black data writes non-image district) is arranged up and down when showing on 4: 3 the LCD panel that aspect ratio is 16: 9 a wide cut live image in aspect ratio.At this moment, only the temperature data that detects according to the one or more temperature probes that shield central video viewing area (words motion video viewing area) corresponding to LCD panel produces control signal, so the temperature data that switching controls needn't detect with reference to the temperature probe corresponding to the black line (rest image viewing area) that shows up and down.
Similarly, can also produce control signal like this: the temperature data that the one or more temperature probes that shield central video viewing area (live image viewing area) corresponding to LCD panel detect is specified big weighting coefficient, and the temperature data that the temperature probe corresponding to the black surround (rest image viewing area) that shows up and down detects is specified little weighting coefficient, calculate weighted mean value again.
As mentioned above,, select the preferable conversion parameter that increases the weight of, can prevent from full frame, to produce twilight sunset and hangover energetically by the temperature data that the video display part (as the district) of moving is used and detected according to this routine LCD.
Though described this example with a kind of configuration, wherein the characteristic quantity of the amount of movement of input image data as a routine input image data, but also can be so suitable increase the weight of conversion parameter and produce control signal: according to the feature of each display image area to selecting, as the contained noisiness of input image data, edge amount, gray level transitions pattern etc., only extract from the temperature data of one or more relevant temperature probes or to they weightings.
Also can provide a kind of collocation method in addition, wherein determine control signal, select the better conversion parameter that increases the weight of by the combination of correctly selecting one of computational algorithm among the 6th embodiment (1)～(6) or using them.
The tenth embodiment
Below with reference to Figure 26 in detail tenth embodiment of the invention is described in detail.Being marked with same symbol with the 6th and the 7th embodiment components identical also omits its description.Figure 26 is the illustrative configurations block diagram of this routine LCD main element.
As shown in figure 26, device as the checkout equipment installment state, this routine LCD comprises rotation sensor 26 in the face that detects LCD panel 4 vertical inverted vertical inverted sensors 25 and detect 4 interior rotation status of LCD panel, and is configured to according to the computing of these testing results with variable mode control CPU17 computing unit 18.
Here, vertical inverted sensor 25 detects the patterns of change between normal mounting state shown in Fig. 6 (a) (perpendicular dress attitude) and the vertical inversion mode shown in Fig. 6 (b) (ceiling suspend attitude), and rotation sensor 26 detects 90 patterns of change of spending between the rotary modes (portrait directional pattern) shown in normal mounting attitude shown in Fig. 6 (a) (the perpendicular attitude of adorning) and Fig. 6 (c) in the face.These sensors 25 and 26 can constitute with independences such as gravity converters, or use general orientation sensor such as gyrosensor etc.
For example, when the equipment installment state when normal mounting attitude (perpendicular dress attitude) switches to vertical inversion mode (ceiling suspend attitude) or 90 degree rotation attitudes (portrait directional pattern), the hot-air path that flows just changes in the device housings, makes that variation also appears in Temperature Distribution in the plane of LCD panel 4.As a result, no longer can read the suitable conversion parameter that increases the weight of, and, cause the risk of image deterioration such as twilight sunset, hangover etc. inappropriate supply LCD panel 4 that increases the weight of to change.
For this reason, in this routine LCD, for reduce the influence that the local pyrexia element depends on the equipment installment state as far as possible, by only taking a sample selectively corresponding to the temperature data in predetermined screen district, or be to calculate weighted mean value to the bigger power of data setting, produce the control signal of selecting suitable view data.
Specifically, according to each equipment installment state, only the temperature data that detects according to the one or more thermometric sensors corresponding to the LCD panel screen district that not influenced by the local pyrexia element produces control signal, with the realization switching controls, thus the temperature data that does not detect with reference to temperature probe corresponding to the LCDs district that influenced by the local pyrexia element.
Perhaps, according to each equipment installment state, produce control signal by calculating weighted mean value, wherein the temperature data that the one or more temperature probes corresponding to the LCD panel screen district that not influenced by the local pyrexia element are detected adds more weights, and the temperature data that the temperature probe corresponding to the LCD panel screen district that influenced by the local pyrexia element is detected adds less weight.
As mentioned above, by this routine LCD, Temperature Distribution in the plane that occurs according to the equipment installment state according to LCD plates, because can be by making predetermined budget and determine the suitable control signal that increases the weight of conversion parameter of selection, so can prevent actively that twilight sunset and conditions of streaking from appearring in whole screen to cutting apart temperature data that screen district detects.
This example can also provide a kind of like this configuration, promptly determines control signal by one of computational algorithm (1)～(6) among choose reasonable the 6th embodiment or the combination of using them, can select the better conversion parameter that increases the weight of by the testing result of equipment installment state.
The 11 embodiment
Below with reference to Figure 27 in detail eleventh embodiment of the invention is described in detail.Being marked with same label with the 6th and the 7th embodiment components identical also omits its description.Figure 27 is the illustrative configurations block diagram of this routine LCD main element.
As shown in figure 27, this routine LCD has a remote control photoelectric sensor 27, can receive the remote signal of specifying the operational order of input corresponding to the user with graphic-remote controller, and be configured to the user command received according to remote control phototube 27, the computing of the computing unit 18 of control control CPU17 changeably.
Particularly, for reducing the picture element deterioration, the twilight sunset that causes as the LCD panel optical response, hangover etc., in the LCD panel entire display screen, show in the part screen district of the attention image that attracts the user, the part screen district that shows attention image is fit to user's appointment, thereby by selectively only sampling or these data added more weights calculate weighted mean value corresponding to the temperature data of specifying the screen district, can produce and select the suitable control signal that increases the weight of to change.
In addition, place the environment of direct blowing of room conditioning or sunlight direct projection in liquid crystal display plate portion screen district, the user can specify about the screen district and eliminate these influences as far as possible, only takes a sample selectively corresponding to the temperature data of specifying the screen district, or these data of calculating weighted mean value are added more weights.
As mentioned above,, increase the weight of conversion parameter, show so the user can realize the excellent picture element image that twilight sunset and hangover reduce because of importing the temperature data choose reasonable of specifying the screen district to detect by the user by this routine LCD.
This example can also provide a kind of configuration, by one of computational algorithm (1)～(6) among correct selection the 6th embodiment or use it and make up to determine control signal, can select the better conversion parameter that increases the weight of by the testing result of user's input.User command obviously can be imported by the control panel that apparatus body is provided with, and is not limited to use telepilot.
Industrial usability
Except that televisor, LCD of the present invention also can be made graphoscope, especially in the upper punch drive arrangements that strengthens the LCD panel optical response, is fit to further improve the picture element of display image.
Claims (21)
1. the conversion parameter that increases the weight of that obtains from comparative result by more current at least and last vertical cycle view data and basis is controlled to the LCD that the LCD panel input image data quickens to drive LCD panel, it is characterized in that described LCD comprises:
Temperature measuring equipment is used for the checkout equipment internal temperature; With
Control device, the device interior variable temperatures ground control that is used for detecting according to temperature measuring equipment increases the weight of conversion parameter, and wherein, described control device produces increasing the weight of to change the parameter control signal of doing variable control by the device interior temperature is added hysteresis.
2. make the LCD that image shows with LCD panel for one kind, it is characterized in that described LCD comprises:
A plurality of temperature measuring equipments are used to detect the temperature of a plurality of cut sections of LCD panel; With
Write gray level and determine device, be used for determining the data converted that increases the weight of of compensation LCD panel optic response feature, its method is the data that the input image data of a vertical cycle are divided into several sections a plurality of cut sections of LCD panel, and in conjunction with the cut section that shows input image data in the LCD panel detect temperature and gray level transitions from last vertical cycle to current vertical cycle, increase the weight of to change every section input image data of cutting apart.
3. LCD as claimed in claim 2 is characterized in that, the described gray level of writing determines that device comprises:
Predetermined a plurality of temperature ranges are stored a plurality of table storeies that several groups of differences increase the weight of conversion parameter, be used for input image data converted to and increase the weight of data converted, by the optical response of the compensation of the gray level transitions from last vertical cycle to current vertical cycle LCD panel; With
Selector switch, be used for according to LCD panel show input image data each cut section detect temperature, select one of a plurality of table storeies, and
Selector switch is read in the selected table storer increases the weight of conversion parameter, determines the data converted that increases the weight of corresponding to input image data with it, again it as writing gray-scale data supply LCD panel.
4. LCD as claimed in claim 2 is characterized in that, the described gray level of writing determines that device comprises:
The table storer, separate with reference to the list area in predetermined a plurality of temperature ranges are stored several groups of different conversion parameters that increase the weight of, be used for input image data converted to and increase the weight of data converted, according to the optical response of the compensation of the gray level transitions from last vertical cycle to current vertical cycle LCD panel; With
Selector switch, be used for according to LCD panel show input image data each cut section detect temperature, select a plurality of with reference to one of list area, and
Selector switch increases the weight of conversion parameter from table is selected in the storer with reference to what read the list area, determines the data converted that increases the weight of corresponding to input image data with it, again it as writing gray-scale data supply LCD panel.
5. LCD as claimed in claim 2 is characterized in that, the described gray level of writing determines that device comprises:
The table storer has stored and has increased the weight of conversion parameter, is used for input image data is increased the weight of data converted to changing into, according to the optical response of the compensation of the gray level transitions from last vertical cycle to current vertical cycle LCD panel;
Subtracter is used for from deducting input image data in the data converted with increasing the weight of to change definite increasing the weight of;
Multiplier is used for the output signal of subtracter is multiplied by weighting coefficient K, and the latter is according to the detecting temperature of cut section that shows input image data in the LCD panel and controlled changeably; With
Totalizer is used for the output signal of multiplier is added to input image data, and
The output signal of totalizer is supplied with LCD panel as writing gray-scale data.
6. make the LCD that image shows with LCD panel for one kind, it is characterized in that described LCD comprises:
A plurality of temperature measuring equipments are used to detect the temperature of a plurality of cut sections of LCD panel;
Calculation element is used for doing predetermined calculating by the temperature data that a plurality of temperature measuring equipments are detected, and produces control signal; With
Write gray level and determine device, be used for by control signal and gray level transitions from last vertical cycle to current vertical cycle according to the calculation element generation, the input image data of current vertical cycle is done the predetermined conversion that increases the weight of, determine the data converted that increases the weight of of compensation LCD panel optical response.
7. LCD as claimed in claim 6 is characterized in that, the described gray level of writing determines that device comprises:
A plurality of table storeies, predetermined a plurality of temperature ranges are stored several groups of different conversion parameters that increase the weight of, be used for input image data converted to and increase the weight of data converted, according to the optical response of the compensation of the gray level transitions from last vertical cycle to current vertical cycle LCD panel; With
Selector switch is used for the control signal according to the calculation element generation, selects one of a plurality of table storeies, and
Selector switch increases the weight of conversion parameter from what described table storer was read, determines the data converted that increases the weight of corresponding to input image data with it, again it as writing gray-scale data supply LCD panel.
8. LCD as claimed in claim 6 is characterized in that, the described gray level of writing determines that device comprises:
The table storer, separate with reference to the list area in predetermined a plurality of temperature ranges are stored several groups of different conversion parameters that increase the weight of, be used for input image data converted to and increase the weight of data converted, according to gray level transitions from last vertical cycle to current vertical cycle, the optical response of compensation LCD panel; With
Selector switch is used for the control signal that produces according to calculation element, select a plurality of with reference to one of list area, and
Selector switch increases the weight of conversion parameter with reference to what read the list area from the selected table storer, determine the data converted that increases the weight of corresponding to input image data with it, again it as writing gray-scale data supply LCD panel.
9. LCD as claimed in claim 2 is characterized in that, the described gray level of writing determines that device comprises:
The table storer has stored and has increased the weight of conversion parameter, and be used for input image data converted to and increase the weight of data converted, according to gray level transitions from last vertical cycle to current vertical cycle, the optical response of compensation LCD panel;
Subtracter is used for from deducting input image data in the translation data with increasing the weight of definite the increasing the weight of of conversion parameter;
Multiplier is used for the output signal of subtracter is multiplied by weighting coefficient K, and the latter is controlled changeably according to the control signal that calculation element produces; With
Totalizer is used for the output signal of multiplier is added to input image data, and
The output signal of totalizer adds to LCD panel as writing gray-scale data.
10. as the LCD of arbitrary claim in the claim 6～9, it is characterized in that described calculation element produces control signal by the mean value that calculates a plurality of temperature measuring equipments and detect temperature.
11. the LCD as arbitrary claim in the claim 6～9 is characterized in that, described calculation element is by calculating the peaked generation control signal that a plurality of temperature measuring equipments detect temperature.
12. the LCD as arbitrary claim in the claim 6～9 is characterized in that, described calculation element produces control signal by the minimum value of calculating a plurality of temperature measuring equipments and detecting temperature.
13. the LCD as the arbitrary claim of claim 6～9 is characterized in that, described calculation element produces control signal by the histogram that forms a plurality of temperature measuring equipments and detect temperature.
14. the LCD as arbitrary claim in the claim 6～9 is characterized in that, described calculation element produces control signal by the weighted mean value that calculates a plurality of temperature measuring equipments and detect temperature.
15. LCD as claim 14, it is characterized in that, described LCD also comprises the characteristic quantity pick-up unit that detects the input image data characteristic quantity, and wherein the characteristic quantity that detects according to described characteristic quantity pick-up unit is obtained the weighted mean value that a plurality of temperature measuring equipments detect temperature.
16. the LCD of claim 14 is characterized in that, also comprises the mount state testing device of checkout equipment installment state, wherein, according to the installment state that mount state testing device detects, obtains the weighted mean value that a plurality of temperature measuring equipments detect temperature.
17. LCD as claim 14, it is characterized in that described LCD also comprises detection user input commands user command pick-up unit, wherein, according to the user command that the user command pick-up unit detects, obtain the weighted mean value that a plurality of temperature measuring equipments detect temperature.
18. the LCD as arbitrary claim in the claim 6～9 is characterized in that, described calculation element produces control signal by the temperature that detects that detects the predetermined temperature measuring equipment of only taking a sample in the temperature at a plurality of temperature measuring equipments.
19. LCD as claim 18, it is characterized in that, described LCD also comprises the characteristic quantity pick-up unit that detects the input image data characteristic quantity, wherein, characteristic quantity according to described characteristic quantity pick-up unit detects detects the temperature that detects of being scheduled to temperature measuring equipment of only taking a sample the temperature from a plurality of temperature measuring equipments.
20. LCD as claim 18, it is characterized in that, described LCD also comprises the mount state testing device of checkout equipment installment state, wherein, installment state according to described mount state testing device detects detects the temperature that detects of being scheduled to temperature measuring equipment of only taking a sample the temperature from a plurality of thermometrics.
21. LCD as claim 18, it is characterized in that, described LCD also comprises the user command pick-up unit that detects user input commands, wherein, user command according to described user command pick-up unit detects detects the temperature that detects of being scheduled to temperature measuring equipment of only taking a sample the temperature from a plurality of temperature measuring equipments.
Applications Claiming Priority (8)
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| JP2001344078 | 2001-11-09 | ||
| JP344078/2001 | 2001-11-09 | ||
| JP2002237875A JP3502627B2 (en) | 2001-11-09 | 2002-08-19 | Liquid crystal display |
| JP237875/2002 | 2002-08-19 | ||
| JP258828/2002 | 2002-09-04 | ||
| JP2002258828 | 2002-09-04 | ||
| JP2002271192 | 2002-09-18 | ||
| JP271192/2002 | 2002-09-18 |
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| CN1582464A true CN1582464A (en) | 2005-02-16 |
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|---|---|---|---|
| CNA028221656A Pending CN1582464A (en) | 2001-11-09 | 2002-11-11 | Liquid crystal display device with a light guide plate |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US7592995B2 (en) |
| EP (1) | EP1443486B1 (en) |
| KR (1) | KR100573323B1 (en) |
| CN (1) | CN1582464A (en) |
| TW (1) | TW200303001A (en) |
| WO (1) | WO2003041043A1 (en) |
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- 2002-11-11 EP EP02802738.1A patent/EP1443486B1/en not_active Expired - Lifetime
- 2002-11-11 CN CNA028221656A patent/CN1582464A/en active Pending
- 2002-11-11 KR KR1020047002435A patent/KR100573323B1/en not_active IP Right Cessation
- 2002-11-11 WO PCT/JP2002/011745 patent/WO2003041043A1/en active Application Filing
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| CN107077820B (en) * | 2014-10-02 | 2020-07-10 | 开利公司 | Liquid crystal display with temperature compensation |
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| CN112199061B (en) * | 2020-09-30 | 2023-06-27 | 联想(北京)有限公司 | Display method and device |
| CN113066438A (en) * | 2021-03-29 | 2021-07-02 | 京东方科技集团股份有限公司 | Brightness compensation device and method and display device |
| CN113066438B (en) * | 2021-03-29 | 2022-07-22 | 京东方科技集团股份有限公司 | Brightness compensation device and method and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20040201564A1 (en) | 2004-10-14 |
| EP1443486A1 (en) | 2004-08-04 |
| WO2003041043A8 (en) | 2005-01-20 |
| EP1443486B1 (en) | 2013-10-09 |
| EP1443486A4 (en) | 2009-04-08 |
| US7592995B2 (en) | 2009-09-22 |
| KR100573323B1 (en) | 2006-04-24 |
| KR20040044453A (en) | 2004-05-28 |
| TW200303001A (en) | 2003-08-16 |
| TWI300547B (en) | 2008-09-01 |
| WO2003041043A1 (en) | 2003-05-15 |
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